What is correlated subquery give an example?

Name: SQL Correlated Subqueries Part 3
Uploaded: 2021-11-15 03:52:54
Description: SQL Correlated Subqueries: A Beginner's Guide is your ultimate resource for understanding the relationship between SQL and database administration. Get up to speed with this helpful guide that will help you find what you need in no time.

Question

Accepted Answer

A correlated subquery refers to a column of a table that is not in the FROM clause of the query. The column can appear in both the Projection and the WHERE clauses. Correlated subqueries, in general, degrade performance.

Course Content

Getting Started

How to use LearnVern

SQL Datatypes

SQL Commands

What is DBMS

What is RDBMS

Database Relationships

Primary Key

Unique Key

Foreign Key

Difference between PK, UK and PK & FK

SQL Server Installation Step by Step

How to Create Database in SQL Server

Assignment : SQL Create Table

SQL Constraints

SQL Insert Statement and SQL Alias

Quiz : SQL Constraints & Alias

Filtering Data using Selection Command

Filtering Data using Comparison Operator

SQL Order by Clause

Assignment : Ordering and Filtering

Quiz : Selection Commands Ordering & Filtering

Aggregate Functions in SQL for Data Analysis

SQL Mathematical Functions for Data Analysis

SQL String Functions for Data Analysis

SQL Date & Time Functions for Data Analysis

SQL Window Functions for Data Analysis

SQL Miscellaneous Functions

Rollup and NTile Function

Row Number Function

DenseRank and Cumulative Distribution

How to use SQL Conditional Statements

How to use SQL Group by Clause

SQL Practical with Examples

Assignment : SQL Date and Time

Quiz : SQL Functions

Type of Joins in SQL - INNER, LEFT

Type of Joins in SQL - RIGHT,SELF,FULL, CARTESIAN

SQL Joins Practical Session 1

SQL Joins Practical Session 2

SQL Joins Practical Session 3

SQL Joins Practical Session 4

SQL Joins Practical Session 5

Assignment : SQL Joins

Assignment : SQL Functions 1

Assignment : SQL Functions 2

Quiz : SQL Join Functions

Practice: SQL Subqueries

Practice: SQL Subqueries & Unions

SQL Correlated Subqueries Part 1

SQL Correlated Subqueries Part 2

SQL Correlated Subqueries Part 3

SQL Correlated Subqueries Part 4

SQL Correlated Subqueries Part 5

Correlated Select, Update & Delete Queries

SQL Union

SQL EXCEPT & INTERSECT

Assignment : SQL SubQueries

Quiz : SQL Sub Queries

SQL Pivot, UnPivot Practical Example - 1

SQL Pivot, UnPivot Practical Example - 2

What are Views?

Examples of SQL Views Part -1

Examples of SQL Views Part -2

Assignment : SQL Views

Quiz : SQL Views

What is SQL Index?

SQL Index types

Quiz : SQL Indexes

Create Tables using Select Statement

Using Correlated Sub Query, Group By with Select Statement

Using Group By and Having Clauses with Select Statement

Using Index Optimizer with Select Statement

Using Union with Select Statement

Adding Multiple Records with Insert Statement

SQL Insert - Considerations and Best Practices

Insertion from Multiple Tables

SQL Delete - Types of Delete Operation Part -1

SQL Delete - Types of Delete Operation Part -2